GaudiUtils::AllocatorPool Class Reference

Allocator pool. More...

#include <GaudiKernel/AllocatorPool.h>

Collaboration diagram for GaudiUtils::AllocatorPool:

List of all members.

Classes
class	PoolChunk
struct	PoolLink
Public Member Functions
	AllocatorPool (unsigned int n=0)
	Create a pool of elements of size n.
	~AllocatorPool ()
	Destructor. Return storage to the free store.
	AllocatorPool (const AllocatorPool &right)
	Copy constructor.
void *	Alloc ()
	Allocate one element.
void	Free (void *b)
	Return an element back to the pool.
unsigned int	Size () const
	Return storage size.
void	Reset ()
	Return storage to the free store.
Private Member Functions
AllocatorPool &	operator= (const AllocatorPool &right)
	Private equality operator.
void	Grow ()
	Make pool larger.
Private Attributes
const unsigned int	esize
const unsigned int	csize
PoolChunk *	chunks
PoolLink *	head
int	nchunks

---

Detailed Description

Allocator pool.

Class is imported from Geant4 project

Date:

2006-02-14

Definition at line 65 of file AllocatorPool.h.

---

Constructor & Destructor Documentation

GaudiUtils::AllocatorPool::AllocatorPool

(

unsigned int

n = 0 )

[explicit]

Create a pool of elements of size n.

Definition at line 53 of file AllocatorPool.cpp.

  : esize(sz<sizeof(PoolLink) ? sizeof(PoolLink) : sz),
    csize(sz<1024/2-16 ? 1024-16 : sz*10-16),
    chunks(0), head(0), nchunks(0)
{}

GaudiUtils::AllocatorPool::~AllocatorPool

(

)

Destructor. Return storage to the free store.

Definition at line 88 of file AllocatorPool.cpp.

{
  Reset();
}

GaudiUtils::AllocatorPool::AllocatorPool

(

const AllocatorPool &

right )

Copy constructor.

Definition at line 63 of file AllocatorPool.cpp.

  : esize(right.esize), csize(right.csize)
{
  *this = right;
} 

---

Member Function Documentation

void * GaudiUtils::AllocatorPool::Alloc

(

)

[inline]

Allocate one element.

Definition at line 127 of file AllocatorPool.h.

{
  if ( head==0 ) { Grow(); }
  PoolLink* p = head;  // return first element
  head = p->next;
  return p;
}

void GaudiUtils::AllocatorPool::Free

(

void *

b )

[inline]

Return an element back to the pool.

Definition at line 140 of file AllocatorPool.h.

{
  PoolLink* p = static_cast<PoolLink*>(b);
  p->next = head;        // put b back as first element
  head = p;
}

void GaudiUtils::AllocatorPool::Grow

(

)

[private]

Make pool larger.

Definition at line 118 of file AllocatorPool.cpp.

{
  // Allocate new chunk, organize it as a linked list of
  // elements of size 'esize'
  //
  PoolChunk* n = new PoolChunk(csize);
  n->next = chunks;
  chunks = n;
  nchunks++;
  
  const int nelem = csize/esize;
  char* start = n->mem;
  char* last = &start[(nelem-1)*esize];
  for (char* p=start; p<last; p+=esize)
  {
    reinterpret_cast<PoolLink*>(p)->next
      = reinterpret_cast<PoolLink*>(p+esize);
  }
  reinterpret_cast<PoolLink*>(last)->next = 0;
  head = reinterpret_cast<PoolLink*>(start);
}

GaudiUtils::AllocatorPool & GaudiUtils::AllocatorPool::operator=

(

const AllocatorPool &

right )

[private]

Private equality operator.

Definition at line 75 of file AllocatorPool.cpp.

{
  if (&right == this) { return *this; }
  chunks  = right.chunks;
  head    = right.head;
  nchunks = right.nchunks;
  return *this;
}

void GaudiUtils::AllocatorPool::Reset

(

)

Return storage to the free store.

Definition at line 97 of file AllocatorPool.cpp.

{
  // Free all chunks
  //
  PoolChunk* n = chunks;
  PoolChunk* p = 0;
  while (n)
  {
    p = n;
    n = n->next;
    delete p;
  }
  head = 0;
  chunks = 0;
  nchunks = 0;
}

unsigned int GaudiUtils::AllocatorPool::Size

(

)

const [inline]

Return storage size.

Definition at line 152 of file AllocatorPool.h.

{
  return nchunks*csize;
}

---

Member Data Documentation

PoolChunk* GaudiUtils::AllocatorPool::chunks [private]

Definition at line 113 of file AllocatorPool.h.

const unsigned int GaudiUtils::AllocatorPool::csize [private]

Definition at line 112 of file AllocatorPool.h.

const unsigned int GaudiUtils::AllocatorPool::esize [private]

Definition at line 111 of file AllocatorPool.h.

PoolLink* GaudiUtils::AllocatorPool::head [private]

Definition at line 114 of file AllocatorPool.h.

int GaudiUtils::AllocatorPool::nchunks [private]

Definition at line 115 of file AllocatorPool.h.

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The documentation for this class was generated from the following files:

• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v23r2/GaudiKernel/GaudiKernel/AllocatorPool.h
• /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v23r2/GaudiKernel/src/Lib/AllocatorPool.cpp